removing exchange 2010 from PDC after mail migration to office365 E2

I am looking for direction on removing exchange 2010 for our network. We have used the Codetwo tool to migrate our users to office365 accounts. Because of hardware requirements, we were not able to use the hybrid deployment as our Exchange server resides on the Domain Controller that holds all of the FSMO roles. Note, this is the only server on the network. We had a sbs2003 server that was updated to a new server box running 2008r2/exchange 2010 sp3. This Migration was done according to Dmazter's blog for the migration steps. And worked well. After many starts we discovered the Azure DirSync tool had could not run on this server as it was running too many roles.

So now we have active office365 not linked to the local domain. So with exchange 2010 sill operating we can not use our office365 accounts on premises until we remove the exchange server. because the share a domain name.

Actions
1) how to cleanly remove all traces of exchange locally. (its all on one server)
2) can i then perform a domain rename locally to get rid of .local and change to .org
3) if the local ad server (which is the only server in the building currently ) changes to the .org domain that is in use with office 365 will this cause any problems.
4) completely starting over is not an option as import account programs use this machine as well.

1. You can remove Exchange services and tools via Control Panel, Programs and Features, Uninstall a Program.
2. Yes, the operation can be done, also you may need to check and change and DNS suffixes on the server(s) to match the new domain name. The random tool is used to perform the rename (see this article on other potential issues: http://technet.microsoft.com/en-us/library/cc738208(v=WS.10).aspx)
3. Depends if the Office 365 domain is Federated or not and whether the federated domain is the same as the AD name.
4. That is okay, always make sure you have a Full backup of the server before you start, so that you can revert back if anything goes wrong.

I know i can use the control panel to remove exchange, but 3 questions remain
1) will that leave the users part of the ad , i need them to remain for authentication to other network resources
2) exchange is on the same server as the domain controller for the network( there is only the one , and it has all fsmo roles) are there any gotches i should be aware of
3) will this then allow users to connect to office.365 for their email while at the same time connecting to the on premies network.

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